the direct answer is you can't unless you used the desktop version and save the return as a pdf. then you could email the pdf copy anywhere you want. it should be in a password protected file. and then a second e-mail to the recipient with the password. this is how many professional tax prep firms handle returns when they need the taxpayer to ok it for filing and he's not available. for example I work in an eastern state but have clients on the West Coast.
